package com.code.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.code.dto.DishDto;
import com.code.entity.Category;
import com.code.entity.Dish;
import com.code.entity.DishFlavor;
import com.code.mapper.DishMapper;
import com.code.service.CategoryService;
import com.code.service.DishFlavorService;
import com.code.service.DishService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

/**
 * 菜品服务接口实现
 * @author admin
 */
@Service
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private DishService dishService;

    @Autowired
    private CategoryService categoryService;

    /**
     * 新增菜品；同时保存对应的口味数据
     * @param dishDto
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDto dishDto) {
        // 保存菜品的基本信息到菜品表dish
        this.save(dishDto);
        // 菜品id
        Long dishId = dishDto.getId();
        // 菜品口味
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors.stream().map(item -> {
            item.setDishId(dishId);
            return item;
        }).collect(Collectors.toList());
        // 保存菜品口味数据到菜品口味表dish_flavor
        dishFlavorService.saveBatch(flavors);
    }

    /**
     * 根据id查询菜品信息和对应的口味信息
     * @param id
     * @return
     */
    @Override
    public DishDto getByIdWithFlavor(Long id) {
        // 查询菜品基本信息，从dish表查询
        Dish dish = this.getById(id);

        DishDto dishDto = new DishDto();
        BeanUtils.copyProperties(dish, dishDto);

        // 查询当前菜品对应的口味信息，从dish_flavor表查询
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId, dish.getId());
        List<DishFlavor> flavors = dishFlavorService.list(queryWrapper);
        dishDto.setFlavors(flavors);
        return dishDto;
    }

    @Override
    @Transactional
    public void updateWithFlavor(DishDto dishDto) {
        // 更新dish表基本信息
        this.updateById(dishDto);

        // 清理当前菜品对应口味数据————dish_flavor表的delete操作
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId, dishDto.getId());
        dishFlavorService.remove(queryWrapper);
        // 添加当前提交过来的口味数据————dish_flavor的insert操作
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors.stream().map(item -> {
            item.setDishId(dishDto.getId());
            return item;
        }).collect(Collectors.toList());
        dishFlavorService.saveBatch(flavors);
    }

    @Override
    public Page dishPage(int page, int pageSize, String name) {
        // 分页构造器
        Page<Dish> pageInfo = new Page<>(page, pageSize);
        Page<DishDto> dishDtoPage = new Page<>();
        // 条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        // 添加过滤条件
        queryWrapper.like(name != name, Dish::getName, name);
        // 添加排序条件，根据sort进行排序
        queryWrapper.orderByDesc(Dish::getUpdateTime);
        // 执行分页查询
        dishService.page(pageInfo, queryWrapper);
        // 对象拷贝
        BeanUtils.copyProperties(pageInfo, dishDtoPage, "records");

        List<Dish> records = pageInfo.getRecords();
        List<DishDto> list = records.stream().map(item -> {
            DishDto dishDto = new DishDto();

            BeanUtils.copyProperties(item, dishDto);

            Long categoryId = item.getCategoryId(); // 分类id
            // 根据id来查询分类对象
            Category category = categoryService.getById(categoryId);
            if (category != null) {
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }

            return dishDto;
        }).collect(Collectors.toList());
        return dishDtoPage.setRecords(list);
    }
}
